rockwell



C. E.,ROCKWELL.

Machine for Making Lead Pipe. No. 19,313. Patented Feb. 9, 1858.

UNIE STAES CHAS. E. ROCKWELL, OF NEW YORK, N. Y.

LEAD-PIPE MACHINE.

T 0 all whom it may concern:

Be it known that I, CHAS. E. ROCKWELL, of New York, in the county of New York and State of New York, have invented an Improvement in Lead-Pipe Machines, and that the following is a full, clear, and exact description of the principle or character which distinguishes it from all other things before known, and of the usual mannor of making, modifying, and using the same, reference being had to the accompanying drawings, of which Figures 1 and 2 represent vertical middle sections through the machine.

My invention consists in an improvement in lead pipe machines, of that class in which a long core is used, whereby I am enabled to make pipe in such machine with great perfection. The long core machine makes stronger pipe than the short core and divided bridge machine, but such has been the difiiculty of keeping the long core in its proper place that it has been but little used but I am enabled to revive its use with great efiiciency by a simple mode of adjusting the die. Attempts have been hitherto made to adjust the die in the long core machine but the machines have failed owing to radical defects in the mode of adjustment. Instead of making. the plate which carries the die to fit into the end of the cylinder, I make it to fit accurately over or upon the end of the cylinder, so that the die is adjusted by adjusting this plate and as the die is accurately fitted into the die plate, and the face of the die plate and of the end of the cylinder are ground to a perfect fit, the movements of the die plate will leave no crevice through which the lead can be forced by the action of the ram or press.

a, represents the lead cylinder, Z), the long core, 0, the die plate fitted over the end of the cylinder and (Z the die.

6 are adjusting screws of which there may be three or more, working through the base plate m against the die plate.

I do not claim broadly the adjustment of the die by means of set screws for I am aware that this is done in I-Iansons patent, 1841.. In this device the lead is prevented from entering the space between the die and the die plate, by means of a thin steel plate, fitted into the bottom of the lead cylinder. This method is liable to the following difficulties and objections :-1st. The plate must be removed in order to change the size of the pipe to be produced; and as the plate can.

only be taken out through the top of the cylinder, the piston and mandrel must be lifted entirely out of the cylinder in order to allow such removal. This consumes much time and is highly convenient. 2d. A clifferent steel plate is required foreach change in the size of the pipe; said plates are very expensive, as they must be made and finished with the greatest accuracy. 3d. In the frequent taking or knocking out of said plates they wear the edges of the cup or cylinder in which they rest and are liable to become leaky, so as to allow the lead to find its way into the space between the die and the die plate. hen this space becomes filled of course there can be no adjustment until the parts are taken to pieces and the lead picked out; this involves much labor. I do not claim, broadly, the making of the die plate of greater diameter than the bore of the cylinder, for I am aware that this is seen in Kehr & Krewznachs plan, Voights Techl. Journal. But in this device, the die plate, although larger than the bore of the cylinder, is not adjustable in a lateral manner or by set screws.

\Vhat I claim and desire to secure by Let ters Patent is,

Having the space between the adjustable die plate (0) and the base plate (m) covered or protected by the end of the lead cylinder (a), the whole constructed as and for the purposes herein set forth.

C. E. ROCKIVELL.

Vitnesses R. T. CAMPBELL. 

